Sound amplifying and distributing device



Aug. 19, 1924.

N. A. CLARK SOUND AMPLIFYING AND DISTRIBUTING DEVICE Filed July 28 1922 Uhn.

INVENTR ATTO .QNEY

WITNESS:

Patented Aug. 19, 1924.

UNITED STATES NATHANIEL A. CLARK, OE DAVENPORT, IOWA.

SOUND AMPLIFYING- AND DISTRIBUTING DEVICE.

Application filed July 28, 1922.

To @ZZ whom t may concern:

Be it known that l, NATHANIEL A. CLARK, a citizen of the United States, residino' at Davenport, in the county of Scott and ate of Iowa, have invented new and useful Improvements in Sound Amplifying and Distributing Devices, of which the following is a specification.

The object of this invention is to eliminate the objectionable vibrations arising from the reproduction of phonographic records, to amplify the sound, and to distribute it in the most effective manner possible, the natural tone being preserved.

A further object is to provide a particular form of amplifying chamber associated with a particular form of distributing device, whereby exceptionally good results are se cured.

With the above and other objects in view, the invention consists in the novel construction and arrangement of elements described, illustrated, and claimed, it being understood that modications may be made within the 25 scope of the claims without departing from the spirit of the invention.

1n carrying out my invention, I provide a box including a motor board 10 and including side walls 11, 12, 13, 14, each side 30 wall being provided with an elongated opening for the distribution of sound waves, in four directions.

The board 10 is provided with an aperture 17 for the tone arm 18, and `the latter is in 35 communication with an amplifying chamber 19 having an upper wall or sound board 20, curved in the manner illustrated.

This element 2O is provided with openings 21, 22, which communicate with a Serial No. 578,175.

chamber 23, the board 2O including a por- 40 tion 24- upwardly deflected and curved as shown. The upper wall of chamber 23 is designated 28. Smaller chambers 25, 26 are located adjacent to the chamber 23 and on opposite sides of the throat portion 27. 't5 The lower walls of the chambers 25, 26 are provided with openings designated 26.

The sound board 20 includes a lower substantially horizontal portion which is approximately in alinement with the upper edge Of one of the openings in the side walls of the box, and the sound board 28 acting as a distributing device is in a line with Ithe lower edges of all of the openings in the side walls, this arrangement being particularly effective in attaining the objects sought to be realized.

A supplement board 30 is mounted below the board 28 and is provided with a central opening 31, forming an air chamber 32 serving t0 modify the effect of the vibrations on element 28.

Vilhat is claimed is:

In a device of the class described, a box including a top, and side walls having openings near the bottom thereof, a sound board extending in the form of a curve from one side wall at a point above the opening therein, and having one edge spaced from the opposite wall, means forming a throat portion in the space thus provided, and a sound board below the curved sound board and below the openings in the side walls, and constituting the lower wall of an amplifying and distributing chamber having communication with the throat portion.

ln testimony whereof l affix my signature.

NATHANEL A. CLARK. 

